Python实现点阵字体读取与转换的方法

Z时代
2024-01-10
分类：综合

点阵字体是指根据文字的像素点来显示的字体，效果如下：

使用Python读取并显示的过程如下：

根据中文字符获取GB2312编码

通过GB2312编码计算该汉字在点阵字库中的区位和码位

通过区位和码位计算在点阵字库中的偏移量

基于偏移量获取该汉字的32个像素存储字节

解析像素字节获取点阵坐标信息

在对应的坐标显示信息位。如该像素点是否显示点亮

使用该代码前提：下载点阵字体库到本地，这里默认使用的是hzk16点阵字库

代码如下：


#!/usr/bin/python
#encoding: utf-8
import binascii
RECT_HEIGHT = 16
RECT_WIDTH = 16
BYTE_COUNT_PER_ROW = RECT_WIDTH / 8
BYTE_COUNT_PER_FONT = BYTE_COUNT_PER_ROW * RECT_HEIGHT
KEYS = [0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01]
class FontRender(object):
 def __init__(self, font_file,
  rect_height=RECT_HEIGHT, rect_width=RECT_WIDTH, byte_count_per_row=BYTE_COUNT_PER_ROW):
 self.font_file = font_file
 self.rect_height = rect_height
 self.rect_width = rect_width
 self.byte_count_per_row = byte_count_per_row
 self.__init_rect_list__()
 def __init_rect_list__(self):
 self.rect_list = [] * RECT_HEIGHT
 for i in range(RECT_HEIGHT):
 self.rect_list.append([] * RECT_WIDTH)
 def get_font_area_index(self, txt, encoding='utf-8'):
 if not isinstance(txt, unicode):
 txt = txt.decode(encoding)
 gb2312 = txt.encode('gb2312')
 hex_str = binascii.b2a_hex(gb2312)
 area = eval('0x' + hex_str[:2]) - 0xA0
 index = eval('0x' + hex_str[2:]) - 0xA0
 return area, index
 def get_font_rect(self, area, index):
 offset = (94 * (area-1) + (index-1)) * BYTE_COUNT_PER_FONT
 btxt = None
 with open(self.font_file, "rb") as f:
 f.seek(offset)
 btxt = f.read(BYTE_COUNT_PER_FONT)
 return btxt
 def convert_font_rect(self, font_rect, ft=1, ff=0):
 for k in range(len(font_rect) / self.byte_count_per_row):
 row_list = self.rect_list[k]
 for j in range(self.byte_count_per_row):
 for i in range(8):
  asc = binascii.b2a_hex(font_rect[k * self.byte_count_per_row + j])
  asc = eval('0x' + asc)
  flag = asc & KEYS[i]
  row_list.append(flag and ft or ff)
 def render_font_rect(self, rect_list=None):
 if not rect_list:
 rect_list = self.rect_list
 for row in rect_list:
 for i in row:
 if i:
  print '■',
 else:
  print '○',
 print
 def convert(self, text, ft=None, ff=None, encoding='utf-8'):
 if not isinstance(text, unicode):
 text = text.decode(encoding)
 for t in text:
 area, index = self.get_font_area_index(t)
 font_rect = self.get_font_rect(area, index)
 self.convert_font_rect(font_rect, ft=ft, ff=ff)
 def get_rect_info(self):
 return self.rect_list
if '__main__' == __name__:
 text = u'同创伟业'
 fr = FontRender('./font/16x16/hzk16h')
 fr.convert(text, ft='/static/*', ff=0)
 # print fr.get_rect_info()
 fr.render_font_rect()